Tomio Geron

For fast-growing technology start-ups, there are many approaches to employee hiring and retention.

Two of the more successful Internet start-ups, Facebook Inc. and Zappos Inc., have very different methods, each with different goals: Facebook wants to hire entrepreneurs even if that means they will eventually leave, while Zappos wants to hire the best people to fit its culture and figure out how to keep them.

What do domain names and Facebook applications have in common? According to entrepreneur Fred Hsu, the founder and chief executive of a new Facebook application company, both can make lots of cash.

Twenty start-ups that participated in Facebook’s just-ended summer incubator program pitched their sites to investors.